24 GHz microwave mode converter optimized for superconducting ECR ion source SECRAL

Journal Article · Mon Feb 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4933023· OSTI ID:22482868

Sun, L.; Zhang, X. Z.; Lu, W.; Zhang, W. H.; Feng, Y. C.; Zhao, H. W. ^[1]; Niu, X. J. ^[2]

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1. Institute of Modern Physics (IMP), Chinese Academy of Science, Lanzhou 730000 (China)
2. University of Electronic Science and Technology of China, Chengdu 610054 (China)

Over-sized round waveguide with a diameter about Ø33.0 mm excited in the TE{sub 01} mode has been widely adopted for microwave transmission and coupling to the ECR (Electron Cyclotron Resonance) plasma with the superconducting ECR ion sources operating at 24 or 28 GHz, such as SECRAL and VENUS. In order to study the impact of different microwave modes on ECRH (Electron Cyclotron Resonance Heating) efficiency and especially the production of highly charged ions, a set of compact and efficient TE{sub 01}-HE{sub 11} mode conversion and coupling system applicable to 24 GHz SECRAL whose overall length is 330 mm has been designed, fabricated and tested. Good agreements between off-line tests and calculation results have been achieved, which indicates the TE{sub 01}-HE{sub 11} converter meets the application design. The detailed results of the optimized coupling system will be presented in the paper.

• OSTI ID: 22482868
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
DESIGN
ECR HEATING
ECR ION SOURCES
EFFICIENCY
ELECTRON CYCLOTRON-RESONANCE
GHZ RANGE 01-100
IONS
LENGTH
MICROWAVE RADIATION
MODE CONVERSION
PLASMA